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Simplifying
2x2 + -20 = 8
Reorder the terms:
-20 + 2x2 = 8
Solving
-20 + 2x2 = 8
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '20' to each side of the equation.
-20 + 20 + 2x2 = 8 + 20
Combine like terms: -20 + 20 = 0
0 + 2x2 = 8 + 20
2x2 = 8 + 20
Combine like terms: 8 + 20 = 28
2x2 = 28
Divide each side by '2'.
x2 = 14
Simplifying
x2 = 14
Take the square root of each side:
x = {-3.741657387, 3.741657387}
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